Indian Journal of Geo Marine Sciences Vol. 48 (11), November 2019, pp. 1695-1698 Occurrence of Alpheus euphrosyne de Man, 1897 (Crustacea: Decapoda: Alpheidae) from the South-Eastern Arabian Sea, India Paras Nath Jha1*, Purushothaman, P.2, Chinnadurai, S.1, Renjith R.K.1, Remesan, M.P.1, Baiju, M.V.1 & Leela Edwin1 1 Fishing Technology Division, ICAR-Central Institute of Fisheries Technology, Cochin, Kerala, India. 2Crustacean Fisheries Division, ICAR-Central Marine Fisheries Research Institute, Cochin, Kerala, India. *[E mail: [email protected]] Received 02 May 2018; revised 24 July 2018 The present study reports the occurrence of the pistol shrimp, Alpheus euphrosyne from the South-Eastern Arabian Sea. Identification of the species was based on morphological and molecular examination. One male and two female specimens were collected from the experimental fishing vessel FV Sagar Harita, operating in the Arabian Sea off the south-west coast of India during May 2016. [Keywords: Alpheid; Alpheus euphrosyne; Marine] Introduction Genomic DNA was extracted from the pleopods Alpheid shrimps are commonly distributed in tropical using the DNeasy® Blood & Tissue Kit (Qiagen, and shallow waters1. The genus Alpheus comprises more Valencia, CA, U.S.A.) according to the manufacturer’s than 300 species; Alpheus species form symbiotic protocol. The mitochondrial marker COI (5’ barcoding associations with corals, anemones, sponge, fishes and region) was amplified using universal primers13. The mangroves2-10. Additionally, several species occur in gene sequences obtained were deposited in NCBI deeper waters5-11. In Indian waters, the genus Alpheus GenBank. Fabricius, 1798 comprises 6 species (Alpheus digitalis, Result Alpheus malabaricus, Alpheus miersi, Alpheus paludicola, Alpheus rapax, and Alpheus spongiarum) Systematics Order : Decapoda Latreille, 180214 although there are chances of more diversity in this area 15 which is unrevealed till now12. Among these, all are Infraorder : Caridea Dana, 1852 Family : Alpheidae Rafinesque, 181516 distributed in shallow and brackish waters at less than 17 100 m in depth. Presently Alpheus euphrosyne de Man, Genus : Alpheus Fabricius, 1798 1897 has a new distribution record from Southeastern Alpheus euphrosyne de Man, 1897 (Fig. 1, 2) Alpheus eurydactylus De Man, 1920: 109 [type Arabian Sea. Very little work on Alpheus shrimp has 18 been carried out in and around Indian waters. With this locality: Java] background, it was felt necessary regarding the identification and reporting of the above species found during experimental trawling. Materials and Methods These specimens were collected on board the fisheries research vessel (FV Sagar Harita) from the south-eastern coast of Arabian Sea (off Cochin) on 13th May 2016 (10° 51' 2.3976'' N, 76° 16' 40.2636'' E, depth 8.5 m). The collected specimens, preserved in 90-95 % ethanol, were deposited at the Marine Biodiversity Museum at ICAR-Central Marine Fisheries Research Institute, Cochin, India Fig. 1 — Alpheus euphrosyne de Man, 1897: Female specimen CL: 15 (ID: ED.2.5.1.6). mm (a), Male specimen CL: 16 mm (b) [Scale bar equal to10 mm.] 1696 INDIAN J. MAR. SCI., VOL. 48, NO. 11, NOVEMBER 2019 Fig. 2 — Species characters (Male, CL: 16 mm) (a) Dorsal view of rostral appearance, (b) Dorsal view of telson, (c) Dorsal view of major chela, (d) Ventral view of major chela, (e) Dorsal view of minor chela, (f) Ventral view of minor chela [Scale bar equal to10 mm] Fig. 3 — Species key characters (Female, CL: 15mm) (a) Dorsal view of major chela, (b) Dorsal view of minor chela, (c) Ventral view of major chela, (d) Ventral view of minor chela [Scale bar equal to10 mm] Alpheus euphrosyne De Man, 1897:745, pl:36, 1979:37;22 Banner A.H. & D.M., 1983:232, Fig. 323 Fig:64 [type locality: Java Sea];19 Banner & Banner, Alpheus euphrosyne euphrosyne– Chace F.A., 1966:130-133;20 Thomas M.M., 1976:667;21 Johnson, 1988:4665 JHA et al.: OCCURRENCE OF ALPHEUS EUPHROSYNE FROM THE SOUTH-EASTERN ARABIAN SEA 1697 Alpheus euphrosyne – Anker A. & De Grave S., specimens are closely similar to the holotype with little 2016:35524 variation. Major chela and minor chela are 2.5 times and 5 times longer than the width in male while in female Material examined minor chela is little smaller than the specimens in A specimens submitted to Marine Biodiversity Banner and Banner.13 The second peraeopod of the Museum at ICAR-Central Marine Fisheries Research collected specimen has 9-10 articles. Examined Institute, Cochin, India (ID: ED.2.5.1.6); 2 FM specimens are smaller in size [2 FM (CL: 14, 15 mm, (CL: 14, 15 mm), 1 M (CL 16 mm), India: Kerala, TL: 41.8, 41 mm), 1 M (CL: 16 mm, TL: 43 mm)], than Cochin, Sep 2016, Coast of South-eastern Arabian those reported by Thomas15 (CL: 18.1 to 19.5 mm), and Sea, Depth: 8 – 15 m. 5 Chace (CL: 20.7 to 21.8 mm). However, specimens are Diagnosis larger than Banner and Banner’s description13 [1 M (TL: Carapace is smooth with minute bristles, the rostrum 35 mm)]. Two female specimens were sequenced for the is short and reaches the base of the first antennular 5’ barcoding region of the mitochondrial gene; COI peduncle, post-rostral carina is faint and extends to were successfully amplified with universal primers13 and orbital hoods. Posteriorly adrostral furrows clearly were submitted to NCBI GenBank (Accession Numbers: delimited with postrostral carina. Branchiocardiac KY673259, KY673260). sulcus was found obscure. The cervical sulcus is reaching up to the hepatic region. A small depression is Acknowledgement present in the hepatic region which extends anteriorly. Authors express thanks to the Director, ICAR-CIFT Outer antennular flagella are shorter than inner flagella for the facilities provided and encouraged. Thanks are and gradually segmented. Antennal scale is smooth and also due to Dr. Arthur Anker, Museum of Zoology, straight on the outside, acute distally, with the presence University of São Paulo, Brazil for confirmation of the of internal setae, and extends to the distal end of the identified specimen, A. euphrosyne. The authors are also antennular peduncle. Third maxilliped: base segment indebted to Ms. Barkha Purohit, Department of Zoology, broad leaf-like structure and extends to the antennular Maharaja Sayajirao University of Baroda, Vadodara, for peduncle. First pereopods: similar proximal to the sharing valuable literature. The help rendered by crew carpus for both minor and major pereopod, the members of F.V. Sagar Harita is greatly acknowledged. presence of long setae at interior margins. Major chela References 3 times as long as wide and laterally compressed; 1 Paulo P.G.P., Cecili B.M. and Arthur A., The Indo-West propodus is broad, stout with two dorsal saddles and Pacific alpheid shrimp Athanas dimorphus Ortmann, 1894: long setae, lateral median margins with setae, inferior first record for Brazil and the western Atlantic. Nauplius 19 (1) margin with a well-developed plunger, ventral portion (2011), 87–96. smooth with long setae; dactylus stout and laterally 2 Castro P., The natantian shrimps (Crustacea, Decapoda) associated with invertebrates in Hawaii. Pacific Sci., 25(1971), compressed, slightly long compared to a fixed finger. 395–403. Minor chela (male) is 5 times as long as wide and 3 Knowlton N. & Keller B.D., A new, sibling species of fingers are sub-equal to the length of palm, dactylus snapping shrimp associated with the Caribbean Sea anemone distinctly balaeniceps; minor chela (female) is 4.3 Bartholomea annulata. Bull. Mar. 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Telson is equal in recent species of the dendrobranchiate, stenopodidean, length of uropods, with the rounded distal end and procarididean and caridean shrimps (Crustacea: Decapoda). smooth setae. Zoologische Mededelingen, 85(2011), 195–589. 7 Bracken-Grissom H.D., Cannon M.E., Cabezas P., Feldmann Discussion R.M., Schweitzer C.E., Ahyong S.T., Felder D.L., Lemaitre R. 13 & Crandall K.A., Comprehensive and integrative reconstruction Banner and Banner provided a brief description and of evolutionary history for Anomura (Crustacea: identifying characters for A. euphrosyne. Present Decapoda) BMC Evol Biol, 13(2013), 1–28. 1698 INDIAN J. MAR. 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